You can never lower your guard. If you do not deal very thoroughly in these matters, you will never get rid of these critters. They are born survivors. Just destroying the brain is not enough. You have to cast them back to hell, where they came from! Only then can you sleep in peace. Once the problem emerges, you have already been careless. Don't screw up in later stages of it will come for you at night!
Read next
From @tunachum